docs: def _extract_groupstyle_docs_params(self):
          """Extract group style parameters"""
          data = '\n'.join([d.rstrip().replace(self.docs['out']['spaces'], '', 1) for d in self.docs['in']['raw'].splitlines()])
          idx = self.dst.get_group_key_line(data, 'param')
          if idx >= 0:
              data = data.splitlines()[idx + 1:]
              end = self.dst.get_group_line('\n'.join(data))
              end = end if end != -1 else len(data)
              for i in range(end):
                  # FIXME: see how retrieve multiline param description and how get type
                  line = data[i]
                  param = None
                  desc = ''
                  ptype = ''
                  m = re.match(r'^\W*(\w+)[\W\s]+(\w[\s\w]+)', line.strip())
                  if m:
                      param = m.group(1).strip()
                      desc = m.group(2).strip()
                  else:
                      m = re.match(r'^\W*(\w+)\W*', line.strip())
                      if m:
                          param = m.group(1).strip()
                  if param:
                      self.docs['in']['params'].append((param, desc, ptype))